Error regarding attaching the database

Hi I am developing an application in titanium. I am trying attach the existing database to the new database Here is my code:

var win1 = Titanium.UI.createWindow({
backgroundColor : '#fff'

});

var scrollView = Titanium.UI.createScrollView({});

var lblid = Titanium.UI.createLabel({ color : "black" });

var lblname = Titanium.UI.createLabel({ color : "black" });

var lbldesg = Titanium.UI.createLabel({ color : "black" });

var lblsalary = Titanium.UI.createLabel({ color : "black" });

scrollView.add(lblid);

scrollView.add(lblname);

scrollView.add(lbldesg);

scrollView.add(lblsalary);

win1.add(scrollView);

win1.open();

var undb = Ti.Database.open('UnencryptedDB.db');

var endb = Ti.Database.open('Encrypted.db');

var dbFile = Ti.Filesystem.getFile(Ti.Filesystem.resourcesDirectory, "UnencryptedDB.db");

alert('The path of the database is '+dbFile.getNativePath());

endb.execute("CREATE TABLE if not exists city (city_id integer PRIMARY KEY ,country_id integer NOT NULL ,city text,latitude real,longitude real)");

endb.execute("ATTACH DATABASE \'"+ dbFile.getNativePath() +"\' as DB1 ");

endb.execute("insert into city select * from DB1.city");

endb.close();

here UnencryptedDB.db is the existing database which is project/Resources folder and Encrypted.db is the new database.

While executing this code I am getting an error like Unable to open the database. Got the error at

"endb.execute("ATTACH DATABASE \'"+ dbFile.getNativePath() +"\' as DB1 ");"

this line. Can anyone tel me why I got this error. Where I went wrong in the code.